矿产品供需关系经济分析     

谢业文 《矿产与地质》2004,18(1):90-92

矿产品供需关系决定矿产品价格的市场走向，运用供需二维图解可以预测矿产品供需动态，给出精确的供需二维图要注意资源增加与减少、代用材料和新产品开发等因素，指出精心积累矿产品供需资料，仔细观察供需关系，可以预测矿产品价格和市场走向。  相似文献   

云南会泽超大型铅锌矿床成因研究中的几个问题   总被引：6，自引：0，他引：6  

黄智龙  李文博  张振亮  韩润生  陈进 《矿物学报》2004,24(2):105-111

位于川-滇-黔铅锌多金属成矿域中南部云南会泽超大型铅锌矿床可能是一种新的铅锌矿床类型，该类铅锌矿床明显特征是规模大、品位富、伴生有用元素多，暗示其成矿环境较为特殊。从成矿时代、成矿物质来源、成矿流体来源与演化，以及峨眉山玄武岩与成矿的关系等方面分析了会泽超大型铅锌矿床的研究进展及国内外研究现状，认为矿床成矿时代与西南大面积峨眉山玄武岩成矿时代相近，成矿物质和成矿流体具有“多源性”，成矿流体存在均一化过程，区域大规模流体运移在该区铅锌成矿过程中具有重要意义，峨眉山玄武岩岩浆活动与铅锌成矿具有密切的成因联系，矿床可能为“均一化成矿流体贯入成矿”的产物。  相似文献   

An attenuation relationship based on Turkish strong motion data and iso-acceleration map of Turkey   总被引：2，自引：0，他引：2  

Resat Ulusay  Ergü  n Tuncay  Harun Sonmez  Candan Gokceoglu 《Engineering Geology》2004,74(3-4):265-291

This paper presents an attenuation relationship of peak ground acceleration (PGA) derived from Turkish strong motion data for rock, soil and soft soil sites and an iso-acceleration map of Turkey based on this relationship. For the purpose, among all the three-component accessible records, 221 records from 122 earthquakes that occurred in Turkey between 1976 and November 2003 were selected. The database was compiled for earthquakes with moment magnitudes (M_w) and PGA values ranging between 4.1 and 7.5, and 20 and 806 gal, and distances to epicenter considered in the database were between 5 and 100 km. From the regression analysis of the data, an attenuation equation of PGA considering rock, soil and soft soil conditions was developed. The PGA values predicted from the equation suggested in this study and those both from a few domestic equations and some imported equations were compared. In addition, an iso-acceleration map of Turkey was constructed using the suggested attenuation equation and considering both known active faults and epicenter locations of the earthquakes that have occurred in Turkey.  相似文献   

基于三角网的"种子法"多边形生成     

艾廷华  陈涛 《武汉大学学报(信息科学版)》2004,29(1):14-19

将传统上广泛使用的“种子法”和“矢量求交法”的思想相结合 ,提出了一种基于约束Delaunay三角网结构的多边形生成算法。详细描述了该方法的基本思想 ,在实验基础上分析了算法的特点。  相似文献   

Study on comparison between absolute and relative input energy spectra and effects of ductility factor     

公茂盛  谢礼立 《地震学报(英文版)》2005,18(6):717-726

Introduction Estimation of an attenuation relationship for strong ground motion parameters has been an interesting research subject in the field of engineering seismology and has played a very important role in seismic safety evaluation, seismic zoning, seismic hazard evaluation of major constructions, etc. At present, the generally used parameters include peak acceleration, peak velocity and elastic response spectrum. Such parameters mentioned above are essentially independent of the duration…  相似文献   

长江三角洲全新世环境演变与人地关系研究综述   总被引：9，自引：1，他引：9  

曹光杰  王建 《地球科学进展》2005,20(7):757-764

综合分析了近20年来长江三角洲全新世环境演变与人地关系研究的进展，着重对长江三角洲的形成与演变、环境演变与人类活动、人地关系的历史演变、古环境研究方法等进行了综述。指出今后研究的主要内容，包括多种环境替代指标的相互验证，高分辨率研究，定量研究，加强环境质量的时空演变研究，加强综合研究，寻求人地关系协调发展的途径。  相似文献   

Reply to Discussion by Kayabali on “Attenuation relationship based on Turkish strong motion data and iso-acceleration map of Turkey” by Ulusay et al., Eng. Geol., 37 (2004)     

R. Ulusay  E. Tuncay  H. Sonmez  C. Gokceoglu 《Engineering Geology》2005,79(3-4):296-299

  相似文献   

沉降-时间曲线呈“S”型的证明及其应用——从土体本构关系   总被引：6，自引：0，他引：6  

梅国雄  宰金珉  殷宗泽  赵维炳 《岩土力学》2005,(Z1)

从土体本构关系出发,严格证明了在线性加载或近似线性加载情况下(这和岩土工程实际加载相类似),沉降-时间曲线呈“S”型,并由此建立了新的沉降-时间预测模型,工程应用证明了该模型的合理性。  相似文献   

Proof of settlement-time curve appearing “S” shape with ramp load and its application base on stress-strain relationship   总被引：1，自引：0，他引：1  

MEI Guo-xiong  ZAI Jin-min  YIN Zong-ze  ZHAO Wei-bing 《岩土力学》2005,26(Z1):21-24

Based on stress-strain relationship of soil, the proof is made for that s-t curve appears “S” shape when the load is increased linearly, which is similar to construction process. A new model of forecasting the relation of settlement-time is presented. Case history shows the rationality of the method.  相似文献   

地理国情各要素之间套合关系检查要点分析     

郎宁  李卓  刘毅 《测绘与空间地理信息》2016,(9):114-116

将地理国情普查工作中地表覆盖和地理国情要素两个重要成果之间的套合关系进行梳理,依据各项规定和生产实践经验,对重点问题进行整理和分析,明确了两者相互关系并提供一些有益的建议,为提高地理国情普查成果质量提供帮助。  相似文献